X-ray K-absorption studies of copper selenides and tellurides

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Abstract
X-ray K-absorption studies of copper selenides and tellurides have been carried out using a 400 mm bent-crystal (mica) transmission spectrograph. The copper K-absorption edge shifts from the low-energy side in Cu2Se, Cu1.83Se and Cu2Te to the higher-energy side in CuSe, CuTe, CuSe2 and CuTe2 with respect to copper metal, whereas the trend of the shift in the selenium K-absorption edge in the copper selenides with respect to selenium metal is just the opposite. These experimentally observed shifts are examined in terms of various parameters such as the effective charge, the symmetry of the valence band and the shift of the Fermi level.

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